/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.ignite.internal.table.distributed.schema;

import java.util.concurrent.CompletableFuture;
import org.apache.ignite.internal.hlc.HybridTimestamp;

/**
 * Used to work with schema versions as seen at a timestamp (applying logic of Schema Synchronization).
 */
public interface SchemaVersions {
    /**
     * Obtains a schema version at a timestamp in obedience to rules of Schema Synchronization.
     *
     * @param timestamp Timestamp at which to obtain a version.
     * @param tableId ID of the table which schema to return.
     * @return Future that will complete with the version.
     */
    CompletableFuture<Integer> schemaVersionAt(HybridTimestamp timestamp, int tableId);

    /**
     * Obtains a schema version at 'now' in obedience to rules of Schema Synchronization.
     *
     * @param tableId ID of the table which schema to return.
     * @return Future that will complete with the version.
     */
    CompletableFuture<Integer> schemaVersionAtNow(int tableId);
}
